April 25, 2013: A US Customs and Border Protection aircraft filmed a circular UAP using WESCAM MX-15 FLIR camera over Aguadilla, Puerto Rico. The object passed over an active runway at low altitude (forcing a FedEx aircraft to hold), moving at high speed without any acoustic signature. It then entered the ocean, was tracked underwater, resurfaced — with a notably hotter thermal signature — and then split into two completely separate objects with distinct thermal profiles. SCU investigators spent two years and 7,027 FLIR frames on a 165-page peer-reviewed analysis. Temperature estimated at ~104°F at hottest point, calibrated against cattle. FOIA request to DHS for full data was denied. No known aircraft, balloon, bird, or atmospheric phenomenon can explain the transmedium transit or the documented split into two independent objects.